Cash, Cash Equivalents, and Investments Cash, Cash Equivalents, and Investments - Schedule of Allowance for Credit Loss Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance as of December 31, 2019			$ 0
Increases to the allowance for credit losses	$ 0	$ 0	160,000	$ 0
Decreases to the allowance for credit losses	(85,000)	0	(85,000)	0
Write-offs			0
Balance as of June 28, 2020	75,000		75,000
Reclassification of credit loss on investments	$ 85,000	$ 0	$ (75,000)	$ 0